diff --git a/weed/command/benchmark.go b/weed/command/benchmark.go
index e241a904e..080312aa8 100644
--- a/weed/command/benchmark.go
+++ b/weed/command/benchmark.go
@@ -125,7 +125,7 @@ func runBenchmark(cmd *Command, args []string) bool {
 		defer pprof.StopCPUProfile()
 	}
 
-	b.masterClient = wdclient.NewMasterClient(b.grpcDialOption, "client", "", 0, strings.Split(*b.masters, ","))
+	b.masterClient = wdclient.NewMasterClient(b.grpcDialOption, "client", "", 0, "", strings.Split(*b.masters, ","))
 	go b.masterClient.KeepConnectedToMaster()
 	b.masterClient.WaitUntilConnected()
 
diff --git a/weed/filer/filer.go b/weed/filer/filer.go
index 35f4cdc6a..d9c250127 100644
--- a/weed/filer/filer.go
+++ b/weed/filer/filer.go
@@ -44,16 +44,15 @@ type Filer struct {
 }
 
 func NewFiler(masters []string, grpcDialOption grpc.DialOption,
-	filerHost string, filerGrpcPort uint32, collection string, replication string, notifyFn func()) *Filer {
+	filerHost string, filerGrpcPort uint32, collection string, replication string, dataCenter string, notifyFn func()) *Filer {
 	f := &Filer{
-		MasterClient:        wdclient.NewMasterClient(grpcDialOption, "filer", filerHost, filerGrpcPort, masters),
+		MasterClient:        wdclient.NewMasterClient(grpcDialOption, "filer", filerHost, filerGrpcPort, dataCenter, masters),
 		fileIdDeletionQueue: util.NewUnboundedQueue(),
 		GrpcDialOption:      grpcDialOption,
 	}
 	f.LocalMetaLogBuffer = log_buffer.NewLogBuffer(LogFlushInterval, f.logFlushFunc, notifyFn)
 	f.metaLogCollection = collection
 	f.metaLogReplication = replication
-
 	go f.loopProcessingDeletion()
 
 	return f
diff --git a/weed/filer/leveldb/leveldb_store_test.go b/weed/filer/leveldb/leveldb_store_test.go
index b07f81129..44625a7d4 100644
--- a/weed/filer/leveldb/leveldb_store_test.go
+++ b/weed/filer/leveldb/leveldb_store_test.go
@@ -11,7 +11,7 @@ import (
 )
 
 func TestCreateAndFind(t *testing.T) {
-	testFiler := filer.NewFiler(nil, nil, "", 0, "", "", nil)
+	testFiler := filer.NewFiler(nil, nil, "", 0, "", "", "", nil)
 	dir, _ := ioutil.TempDir("", "seaweedfs_filer_test")
 	defer os.RemoveAll(dir)
 	store := &LevelDBStore{}
diff --git a/weed/server/filer_server.go b/weed/server/filer_server.go
index 065bb3251..dc93ae062 100644
--- a/weed/server/filer_server.go
+++ b/weed/server/filer_server.go
@@ -89,7 +89,7 @@ func NewFilerServer(defaultMux, readonlyMux *http.ServeMux, option *FilerOption)
 		glog.Fatal("master list is required!")
 	}
 
-	fs.filer = filer.NewFiler(option.Masters, fs.grpcDialOption, option.Host, option.Port, option.Collection, option.DefaultReplication, func() {
+	fs.filer = filer.NewFiler(option.Masters, fs.grpcDialOption, option.Host, option.Port, option.Collection, option.DefaultReplication, option.DataCenter, func() {
 		fs.listenersCond.Broadcast()
 	})
 	fs.filer.Cipher = option.Cipher
diff --git a/weed/server/master_server.go b/weed/server/master_server.go
index cc1c4b2ad..ccc94ebac 100644
--- a/weed/server/master_server.go
+++ b/weed/server/master_server.go
@@ -93,7 +93,7 @@ func NewMasterServer(r *mux.Router, option *MasterOption, peers []string) *Maste
 		preallocateSize: preallocateSize,
 		clientChans:     make(map[string]chan *master_pb.VolumeLocation),
 		grpcDialOption:  grpcDialOption,
-		MasterClient:    wdclient.NewMasterClient(grpcDialOption, "master", option.Host, 0, peers),
+		MasterClient:    wdclient.NewMasterClient(grpcDialOption, "master", option.Host, 0, "", peers),
 		adminLocks:      NewAdminLocks(),
 	}
 	ms.bounedLeaderChan = make(chan int, 16)
diff --git a/weed/shell/commands.go b/weed/shell/commands.go
index 1a937ad53..0e285214b 100644
--- a/weed/shell/commands.go
+++ b/weed/shell/commands.go
@@ -45,7 +45,7 @@ var (
 func NewCommandEnv(options ShellOptions) *CommandEnv {
 	ce := &CommandEnv{
 		env:          make(map[string]string),
-		MasterClient: wdclient.NewMasterClient(options.GrpcDialOption, pb.AdminShellClient, "", 0, strings.Split(*options.Masters, ",")),
+		MasterClient: wdclient.NewMasterClient(options.GrpcDialOption, pb.AdminShellClient, "", 0, "", strings.Split(*options.Masters, ",")),
 		option:       options,
 	}
 	ce.locker = exclusive_locks.NewExclusiveLocker(ce.MasterClient)
diff --git a/weed/wdclient/masterclient.go b/weed/wdclient/masterclient.go
index e91e6f28e..e39b9dfdf 100644
--- a/weed/wdclient/masterclient.go
+++ b/weed/wdclient/masterclient.go
@@ -24,14 +24,14 @@ type MasterClient struct {
 	vidMap
 }
 
-func NewMasterClient(grpcDialOption grpc.DialOption, clientType string, clientHost string, clientGrpcPort uint32, masters []string) *MasterClient {
+func NewMasterClient(grpcDialOption grpc.DialOption, clientType string, clientHost string, clientGrpcPort uint32, clientDataCenter string, masters []string) *MasterClient {
 	return &MasterClient{
 		clientType:     clientType,
 		clientHost:     clientHost,
 		grpcPort:       clientGrpcPort,
 		masters:        masters,
 		grpcDialOption: grpcDialOption,
-		vidMap:         newVidMap(),
+		vidMap:         newVidMap(clientDataCenter),
 	}
 }
 
@@ -89,7 +89,7 @@ func (mc *MasterClient) tryAllMasters() {
 		}
 
 		mc.currentMaster = ""
-		mc.vidMap = newVidMap()
+		mc.vidMap = newVidMap("")
 	}
 }
 
diff --git a/weed/wdclient/vid_map.go b/weed/wdclient/vid_map.go
index b72ac3f55..09b9eb71c 100644
--- a/weed/wdclient/vid_map.go
+++ b/weed/wdclient/vid_map.go
@@ -24,13 +24,14 @@ type Location struct {
 type vidMap struct {
 	sync.RWMutex
 	vid2Locations map[uint32][]Location
-
-	cursor int32
+	DataCenter    string
+	cursor        int32
 }
 
-func newVidMap() vidMap {
+func newVidMap(dataCenter string) vidMap {
 	return vidMap{
 		vid2Locations: make(map[uint32][]Location),
+		DataCenter:    dataCenter,
 		cursor:        -1,
 	}
 }
@@ -57,7 +58,11 @@ func (vc *vidMap) LookupVolumeServerUrl(vid string) (serverUrls []string, err er
 		return nil, fmt.Errorf("volume %d not found", id)
 	}
 	for _, loc := range locations {
-		serverUrls = append(serverUrls, loc.Url)
+		if vc.DataCenter == "" || loc.DataCenter == "" || vc.DataCenter != loc.DataCenter {
+			serverUrls = append(serverUrls, loc.Url)
+		} else {
+			serverUrls = append([]string{loc.Url}, serverUrls...)
+		}
 	}
 	return
 }
@@ -93,7 +98,6 @@ func (vc *vidMap) GetVidLocations(vid string) (locations []Location, err error)
 func (vc *vidMap) GetLocations(vid uint32) (locations []Location, found bool) {
 	vc.RLock()
 	defer vc.RUnlock()
-
 	locations, found = vc.vid2Locations[vid]
 	return
 }
diff --git a/weed/wdclient/vid_map_test.go b/weed/wdclient/vid_map_test.go
index 87be2fc25..0cea698ac 100644
--- a/weed/wdclient/vid_map_test.go
+++ b/weed/wdclient/vid_map_test.go
@@ -45,7 +45,7 @@ func TestLocationIndex(t *testing.T) {
 	mustOk(7, maxCursorIndex, 0)
 
 	// test with constructor
-	vm = newVidMap()
+	vm = newVidMap("")
 	length := 7
 	for i := 0; i < 100; i++ {
 		got, err := vm.getLocationIndex(length)